Filler, battery pack and electrical device

Abstract

A filler (200), a battery pack (10), and an electrical device (20). The filler (200) is adapted to be arranged in a filling space (101) between a battery cell group (300) and a side wall of a tray (100); the filler (200) is provided with a first channel (211), an inlet (2113) of the first channel (211) being used for leading to a battery cell accommodating space (111) in the tray (100), and an outlet (2114) of the first channel (211) being used for leading to the outside of the battery cell accommodating space (111).

Description

Fillers, battery packs and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on December 28, 2023, with application number 202323667001.5 and titled “Filling member, battery pack and electrical equipment,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular, to a filling piece, a battery pack, and an electrical device. Background Art

[0004] In the prior art, to fit the cell pack into the battery pack tray, a gap (also known as a filler space) is typically reserved between the side beams of the cell pack tray. This gap is typically filled with foam material to provide restraint for the cell pack. However, this type of foam material only has a limited function.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to provide a filling piece, a battery pack and an electrical device, wherein the filling piece can provide a restraining force to the battery cell group and is conducive to improving the reliability of exhaust and pressure relief of the battery pack.

[0007] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present disclosure proposes a filling piece, which is suitable for being arranged in the filling space between the battery cell group and the side wall of the tray; a first channel is provided in the filling piece, and the inlet of the first channel is used to communicate with the battery cell accommodating space in the tray, and the outlet of the first channel is used to communicate with the outside of the battery cell accommodating space.

[0008] Optionally, the filling member includes a first supporting portion, one side of which is used to abut the battery cell group, and the inlet is provided in the first supporting portion, and the inlet is communicated with at least one side of the first supporting portion used to abut the battery cell group.

[0009] Optionally, a first notch is provided at one end of the first supporting portion, and the first notch is adapted to define a first opening together with a side wall of the tray, and the first opening is communicated with the inlet.

[0010] Optionally, a second notch is formed at the other end of the first supporting portion, and the second notch is adapted to define a second opening together with the side wall of the tray, and the second opening is communicated with the outlet.

[0011] Optionally, a plurality of first weight-reducing holes are provided in the first support portion, and at least one of the plurality of first weight-reducing holes is the first channel.

[0012] Optionally, the filling piece further includes a second supporting portion, which is arranged on the other side of the first supporting portion, and an end of the second supporting portion away from the first supporting portion is suitable for being connected to the side wall of the tray.

[0013] Optionally, the first support portion and the second support portion are integrally formed or fixed by welding.

[0014] Optionally, the first supporting portion and the second supporting portion are perpendicular.

[0015] Optionally, a plurality of second weight-reducing holes are provided in the second supporting portion.

[0016] Optionally, one side of the first support portion in the width direction is used to abut against the battery cell group, and there are multiple second support portions, which are arranged at intervals along the length direction of the first support portion.

[0017] Optionally, at least one glue groove is provided on one side of the filling piece in the height direction.

[0018] Optionally, the width of the glue groove is L, the width of the filling piece where the glue groove is located is B, and L and B satisfy: L=(1 / 3~1 / 4)B.

[0019] Optionally, the edge of the notch of the glue groove is an arc angle, and the side wall of the glue groove and the bottom of the glue groove are in an arc transition.

[0020] Optionally, the filling piece is a profile piece.

[0021] Optionally, the filling piece is an aluminum profile piece.

[0022] The second aspect embodiment of the present disclosure proposes a battery pack, the structure of which includes a tray, a battery cell group and the above-mentioned filling piece; the tray has a battery cell accommodating space with a top opening, the battery cell group is placed in the battery cell accommodating space, the filling space is formed between the battery cell group and the side wall of the tray, and the filling piece is arranged in the filling space.

[0023] Optionally, the tray includes a tray body and a partition beam arranged in the tray body, the partition beam divides the tray body into multiple battery cell accommodating spaces; the filling space is formed between the side wall of the tray body and the battery cell group, and / or the filling space is formed between the side wall of the partition beam and the battery cell group.

[0024] Optionally, the partition beam includes a transverse beam and / or a longitudinal beam, and there are multiple filling pieces, wherein the multiple filling pieces include filling pieces symmetrically arranged along the longitudinal beam, and / or the multiple filling pieces include filling pieces symmetrically arranged along the transverse beam.

[0025] Optionally, a plurality of battery cell groups are provided in the battery cell accommodating space, a second channel is provided between the side wall of the partition beam and the battery cell groups, and the second channel is communicated with the inlet.

[0026] Optionally, a partition is provided between the side wall of the battery cell group and the filling member, an air guide hole is opened on the partition, and the inlet and the second channel are connected through the air guide hole.

[0027] Optionally, the battery pack further includes an upper cover, which is arranged at the opening of the battery cell accommodating space, and one side of the filling piece in the height direction is connected to the upper cover.

[0028] Optionally, one side of the filling piece in the height direction is bonded to the upper cover.

[0029] A third embodiment of the present disclosure provides an electrical device, which includes the above-mentioned battery pack.

[0030] Through the above technical solution, after the filler is set in the filling space between the battery cell group and the side wall of the tray, the filler can provide sufficient restraint to the battery cell group to avoid lithium plating in the battery cell group, which is beneficial to improving the service life of the battery cell group. At the same time, the inlet of the first channel of the filler is connected to the battery cell accommodation space in the tray, and the outlet of the first channel is connected to the outside of the battery cell accommodation space. Therefore, when the battery cell group generates smoke due to thermal failure and the pressure of the battery cell group rises, the generated smoke can be quickly discharged to the outside of the battery cell accommodation space through the first channel, so that when the battery cell group fails thermally, it can quickly respond to pressure relief, avoiding the battery pack explosion caused by untimely pressure relief. In this way, the filler plays a dual role, which can provide restraint to the battery cell group and define the above-mentioned first channel to improve the reliability of exhaust and pressure relief of the battery pack.

[0031] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] FIG1 is a schematic structural diagram of a filling member provided by an exemplary embodiment of the present disclosure;

[0034] FIG2 is a right side view of a filling member provided by an exemplary embodiment of the present disclosure;

[0035] FIG3 is a schematic diagram of installing a filling member in a battery pack according to an exemplary embodiment of the present disclosure;

[0036] FIG4 is a partial enlarged view of point A in FIG3 ;

[0037] FIG5 is a partial enlarged view of point B in FIG3 ;

[0038] FIG6 is an exploded schematic diagram of a battery pack provided in an exemplary embodiment of the present disclosure;

[0039] FIG7 is a schematic structural diagram of a partition beam provided by an exemplary embodiment of the present disclosure;

[0040] FIG8 is a schematic structural diagram of an electric device provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0042] In the description of the present disclosure, it should be understood that the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are defined based on the drawing orientation of the accompanying drawings (e.g., FIG. 2 ), and are intended solely to facilitate the description of the present disclosure and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, specific orientation structure, or operation, and therefore should not be construed as limitations on the present disclosure. Furthermore, the terms "inside" and "outside" refer to the inside and outside of the corresponding structural outlines. Furthermore, the terms "first" and "second" and the like are used solely to distinguish one element from another and do not convey sequentiality or importance.

[0043] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0044] As mentioned above, in the related art, the filling material only serves to provide a restraining force to the battery cell group and has a single function.

[0045] In view of this, as shown in Figures 1 to 6, the present disclosure, in a first aspect, provides a filling piece 200, which is suitable for being arranged in the filling space 101 between the battery cell group 300 and the side wall of the tray 100, and the filling piece 200 is provided with a first channel 211, the inlet 2113 of the first channel 211 is used to communicate with the battery cell accommodating space 111 in the tray 100, and the outlet 2114 of the first channel 211 is used to communicate with the outside of the battery cell accommodating space 111.

[0046] Through the above technical solution, after the filler 200 is placed in the filling space 101 between the battery cell group 300 and the side wall of the tray 100, the filler 200 can support the battery cell group 300, provide sufficient restraint, prevent lithium plating, and help improve the service life of the battery cell group 300. At the same time, the inlet 2113 of the first channel 211 of the filler 200 is connected to the battery cell accommodating space 111 in the tray 100, and the outlet 2114 of the first channel 211 is connected to the outside of the battery cell accommodating space 111. Therefore, when the battery cell group 300 generates smoke due to thermal failure, causing the pressure in the battery cell group 300 to rise, the generated smoke can be quickly discharged to the outside of the battery cell accommodating space 111 through the first channel 211, thereby quickly responding to pressure relief when the battery cell group 300 fails, and avoiding the battery pack 10 explosion caused by untimely pressure relief.

[0047] Thus, in the present disclosure, the filler 200 can serve a dual purpose, providing a restraining force to the battery cell group 300 and defining the first channel 211 , thereby improving the reliability of exhaust and pressure relief of the battery pack 10 .

[0048] It will be appreciated that in some optional embodiments, as shown in FIG4 , the tray 100 may be provided with an explosion-proof valve 120, and the outlet 2114 of the first channel 211 may be connected to the explosion-proof valve 120, so that smoke generated within the cell accommodation space 111 due to thermal failure of the cell pack 300 is discharged outside the tray 100 through the first channel 211 and the explosion-proof valve 120. In some other optional embodiments, a channel connecting the inside and outside of the tray 100 may also be provided on the tray 100, and a thin film structure may be provided within the channel so that when smoke generated due to thermal failure of the cell pack 300 causes the pressure in the cell accommodation space 111 to increase, the smoke can act on the thin film structure through the first channel 211, and the smoke can be discharged outside the tray 100 after breaking through the thin film structure.

[0049] It should be pointed out that the first channel 211 can be a channel defined solely by the inside of the filling piece 200, or it can be a channel set on the surface of the filling piece 200 and defined jointly by the filling piece 200 and other components in the battery pack 10. The present disclosure does not make any specific restrictions on this.

[0050] In some optional embodiments, the first channel 211 is disposed inside the filling member 200 and is independently defined by the filling member, so that the first channel 211 is relatively independent and has better sealing properties, thereby reducing channel leakage.

[0051] Hereinafter, the present disclosure will describe the structure of the filling member 200 in detail by taking the first channel 211 as a hole-shaped channel independently defined inside the filling member as an example.

[0052] In some optional embodiments, as shown in Figures 1 and 2, the filling member 200 includes a first support portion 210, one side of the first support portion 210 is used to abut the battery cell group 300, the inlet of the first channel 211 is arranged on the first support portion 210, and the inlet 2113 of the first channel 211 is connected to at least one side of the first support portion 210 for abutting the battery cell group 300.

[0053] By placing one side of the first support portion 210 in contact with the battery cell group 300, the battery cell group 300 is supported in a limited position. Furthermore, the inlet 2113 of the first channel 211 is positioned on the side of the first support portion 210 that contacts the battery cell group 300, so that the inlet 2113 of the first channel 211 faces the battery cell group 300. This allows smoke generated by thermal failure of the battery cell group 300 to enter the first channel 211 more quickly through the inlet 2113.

[0054] Of course, it should be pointed out that the inlet 2113 of the first channel 211 can be set at the end of the first channel 211 and connected to at least one side of the first support portion 210 for abutting the battery cell group 300. The first channel 211 can also be set at a position between the two ends of the first channel 211 and connected to at least one side of the first support portion 210 for abutting the battery cell group 300. The present disclosure does not make specific restrictions on this.

[0055] In addition, in some optional embodiments, the inlet 2113 of the first channel 211 can also be set to the top of the first support part 210 to communicate with the channel set in the upper cover 400 inside the battery pack 10; or the inlet 2113 of the first channel 211 is set to the bottom of the first support part 210 to communicate with the channel set on the bottom plate 113 of the battery tray 100; or the inlet 2113 of the first channel 211 is set to the side wall away from the first supporting battery cell group 300 to communicate with the channel set on the side wall of the tray 100.

[0056] The first channel 211 may be arranged in a direction along the length direction of the first support portion 210 or along the width direction of the first support portion 210 , and the present disclosure does not impose any specific limitation on this.

[0057] In some optional embodiments, as shown in Figure 1, the first channel 211 is extended along the length direction of the first support portion 210, and has a longer channel length compared to the first channel 211 extending along the width direction of the first support portion 210, so that the inlet 2113 of the first channel 211 can be connected to the battery cell group 300 farther away from the explosion-proof valve 120.

[0058] Next, the present disclosure elaborates on the location and structure of the inlet 2113 and the outlet 2114 of the first channel 211 in detail.

[0059] Regarding the inlet 2113 of the first channel 211 , as shown in FIG1 , in some optional embodiments, a first notch 2111 is provided at one end of the first support portion 210 . The first notch 2111 is adapted to define a first opening 2115 together with the side wall of the tray 100 . The first opening 2115 is connected to the inlet 2113 .

[0060] The first notch 2111 and the tray 100 together define a first opening 2115 communicating with the inlet 2113. Compared to providing a hole in the filler 200 communicating with the inlet 2113, the first notch 2111 has a larger opening area and more opening directions, allowing smoke to more easily enter the first channel 211, thereby improving smoke exhaust efficiency. Furthermore, the first notch 2111 and the tray 100 together define the first opening 2115, making the inlet 2113 less likely to be blocked by components within the battery pack 10.

[0061] Of course, in some optional implementations, a hole may be provided on the filling piece 200 to communicate with the inlet 2113 of the first channel 211 .

[0062] It should be noted that the position of the first notch 2111 can be set accordingly based on the location of the first channel 211. The first notch 2111 can be set to pass through two surfaces (opposite surfaces or two adjacent surfaces) of the first support portion 210, or it can be set to pass through three adjacent surfaces of the first support portion 210. The side wall of the pallet 100 can be the side wall of the side beam 112 of the pallet 100, or it can be the side wall of the partition beam 130 formed by the transverse beam 131 and / or longitudinal beam 132 of the pallet 100, and this disclosure does not impose any specific limitations on this.

[0063] In some other optional implementations, the first notch 2111 may also be provided between the two ends of the first support portion 210 . In this case, the first notch 2111 may directly define the first opening 2115 .

[0064] Regarding the outlet 2114 of the first channel 211 , as shown in FIG1 , in some optional embodiments, a second notch 2112 is provided at the other end of the first support portion 210 , and the second notch 2112 is suitable for defining a second opening 2116 together with the side wall of the tray 100 ; the second opening 2116 is connected to the outlet 2114 .

[0065] The second notch 2112 and the side wall of the tray 100 are jointly defined to form a second opening 2116 connected to the outlet 2114. Compared with opening a hole in the filler 200 to connect to the outlet 2114, the second notch 2112 has a larger opening area and more opening directions, so that the smoke can be discharged from the first channel 211 more easily, so that the smoke can be quickly dispersed, and the pressure in the battery cell group 300 can be prevented from rising sharply in a short period of time. At the same time, by forming the second notch 2112 and the tray 100 to jointly define the second opening 2116, the outlet 2114 is not easily blocked by components in the battery pack 10.

[0066] Of course, in some optional implementations, a hole may be provided on the filling piece 200 to communicate with the outlet 2114 of the first channel 211 .

[0067] In some other optional embodiments, the second notch 2112 may also be provided between the two ends of the first support portion 210 .

[0068] It should be noted that the location of the second notch 2112 can be adjusted accordingly based on the location of the first passage 211. The second notch 2112 can be arranged to extend through two surfaces (opposite or adjacent surfaces) of the first support portion 210, or through three adjacent surfaces of the first support portion 210. Furthermore, the sidewalls of the pallet 100 can be the sidewalls of the side beams 112 of the pallet 100, or the sidewalls of the partition beams 130 formed by the transverse beams 131 and / or longitudinal beams 132 of the pallet 100.

[0069] The first channel 211 may be formed by utilizing other channels in the filling member 200 or by providing an additional channel. This embodiment does not impose any specific limitation thereto.

[0070] As shown in FIG. 1 and FIG. 2 , in some optional embodiments, a plurality of first weight-reducing holes 212 are provided in the first support portion 210 , and at least one of the plurality of first weight-reducing holes 212 is a first channel 211 .

[0071] Providing weight-reducing holes within the first support portion 210 can reduce the weight of the first support portion 210, thereby reducing the overall weight of the battery pack 10. Furthermore, by utilizing at least one of the first weight-reducing holes 212 as a first passage 211, this can be achieved by simply providing an inlet 2113 and an outlet 2114 in the first weight-reducing hole 212 that will serve as the first passage 211. Furthermore, the first weight-reducing hole 212 can simultaneously perform both weight-reduction and smoke exhaust functions.

[0072] In some optional embodiments, as shown in Figures 1 and 2, a plurality of first lightening holes 212 are spaced apart along the height direction of the first support portion 210. Thus, first lightening holes 212 of different heights can be selected as the first channel 211 according to the installation height of the explosion-proof valve 120 on the pallet 100.

[0073] Regarding the arrangement of the plurality of first lightening holes 212, in some optional embodiments, as shown in FIG2 , the plurality of first lightening holes 212 are parallel to each other and spaced evenly apart. This ensures that the thickness of the ribs formed between two adjacent first lightening holes 212 is equal, thereby ensuring the strength and stability of the first support member.

[0074] The above-mentioned first support portion 210 has a variety of optional fixing methods in the tray 100. The first support portion 210 can be directly connected to the tray 100 to provide a restraining force for the battery cell group 300, or it can be indirectly connected to the tray 100 through other components in the tray 100 to provide a restraining force for the battery cell group 300. This disclosure does not make specific restrictions on this.

[0075] In some optional embodiments, the filler 200 further includes a second support portion 220 , which is disposed on the other side of the first support portion 210 , and an end of the second support portion 220 away from the first support portion 210 is suitable for connecting to the side wall of the tray 100 .

[0076] The second support portion 220 connects the first support portion 210 and the side wall of the tray 100 , so that the second support portion 220 can provide a restraining force for the first support portion 210 , so that the first support portion 210 can more stably support the battery cell group 300 .

[0077] It should be noted that, when the second support portion 220 is not provided, the first support portion 210 can provide a restraining force for the battery cell group 300 by being directly fixedly connected to the tray 100 .

[0078] It is understood that different numbers of cell packs 300 can be arranged in the same battery pack 10 to achieve different battery capacities, and the volume of the filling space 101 formed between the cell packs 300 and the tray 100 will also vary. Therefore, the length of the first support portion 210 and the length of the second support portion 220 can be adjusted accordingly based on the volume of the filling space 101 and the placement of the filler 200.

[0079] In some optional embodiments, the first support portion 210 and the second support portion 220 are integrally formed or fixed by welding.

[0080] The first support portion 210 and the second support portion 220 are integrally formed or welded and fixed. On the one hand, this enables the filler 200 composed of the first support portion 210 and the second support portion 220 to form a modular whole, thereby facilitating rapid filling operations of the battery pack 10 on the production line. On the other hand, the welding and integral forming methods can also make the connection between the first support portion 210 and the second support portion 220 more stable.

[0081] Of course, in some other optional embodiments, the first support portion 210 and the second support portion 220 may also be formed by other connection methods such as bolt connection, bonding or snap connection.

[0082] The first support portion 210 and the second support portion 220 can have various connection angles. In some optional embodiments, the first support portion 210 and the second support portion 220 are perpendicular to each other. The first support portion 210 is perpendicular to the second support portion 220, which enables the second support portion 220 to vertically support the first support portion 210, thereby enabling the second support portion 220 to provide greater support force and more stable support for the first support portion 210.

[0083] Of course, in some other optional implementations, the first support portion 210 and the second support portion 220 may also be connected at an angle.

[0084] Regarding the structure inside the second support portion 220, in some optional embodiments, a plurality of second weight-reducing holes 221 are provided in the second support portion 220. The second weight-reducing holes 221 can reduce the weight of the second support portion 220, thereby reducing the overall weight of the battery pack 10.

[0085] When a plurality of second weight-reducing holes 221 are provided inside the second supporting portion 220 , in some optional embodiments, the plurality of second weight-reducing holes 221 are spaced apart along a height direction of the second supporting portion 220 .

[0086] The aforementioned fixing methods of the filling piece 200 in the tray 100 include, but are not limited to, any fixing method such as bonding, welding, bolt connection, and clamping.

[0087] To provide a more stable restraining force for the cell pack 300, one side of the first support portion 210 in the width direction is used to abut the cell pack 300. Multiple second support portions 220 are provided, and the plurality of second support portions 220 are spaced apart along the length of the first support portion 210. The plurality of second support portions 220 spaced apart along the length of the first support portion 210 increases the support area of ​​the second support portion 220 on the first support portion 210, reduces the pressure exerted by the first support portion 210 on a single second support portion 220, and thereby provides a more stable restraining force for the cell pack 300.

[0088] It should be noted that, as shown in Figure 1, the width direction of the first support portion 210 refers to the Y direction in Figure 1. The length direction of the first support portion 210 refers to the X direction in Figure 1, which is also the extension direction of the first lightening hole 212. The height direction of the first support portion 210 refers to the Z direction in Figure 1. The length direction of the second support portion 220 refers to the Y direction in Figure 1, which is also the extension direction of the second lightening hole 221. The width direction of the second support portion 220 refers to the X direction in Figure 1. The height direction of the second support portion 220 refers to the Y direction in Figure 1.

[0089] As shown in Figure 3, after the first support part 210 is filled in the filling space 101, the width direction of the first support part 210 can be the same as the width direction of the tray 100, the length direction of the first support part 210 can be the same as the length direction of the tray 100, and the height direction of the first support part 210 can be the same as the height direction of the tray 100.

[0090] As shown in FIG. 1 and FIG. 2 , in some optional embodiments, at least one glue groove 230 is provided at the bottom of the filling piece 200 , or at one side in the height direction of the filling piece 200 .

[0091] The side of the filler 200 in the height direction refers to the Y direction as shown in FIG1 . The side of the filler 200 in the height direction can be either the top or the bottom of the filler 200. The adhesive groove 230 is used to accommodate adhesive so that when the bottom or top of the filler 200 is bonded to a contacting component, the adhesive groove 230 can, on the one hand, accommodate excess adhesive and reduce the amount of adhesive overflowing from the edge of the filler 200 during the bonding process. On the other hand, the adhesive groove 230 can also increase the bonding area between the filler 200 and the contacting component, thereby increasing the bonding strength. Furthermore, after curing, the adhesive accumulated in the adhesive groove 230 can form a protrusion structure, which can limit the filler 200 to a certain extent, further improving the stability of the filler 200 and the bonded component.

[0092] It should be noted that the component contacted by the bottom of the adhesive groove 230 can be the bottom plate 113 of the tray 100 or a cold plate placed on the bottom plate 113 of the tray 100. Furthermore, when the bottom of the adhesive groove 230 is bonded to the cold plate, bonding does not damage the cold plate, as compared to welding. Therefore, battery packs 10 with different cell counts can share the same-sized cold plate, significantly saving both development costs and subsequent mass production costs. This also facilitates material quality management and improves product yield.

[0093] In some optional implementations, the adhesive may be structural adhesive 500 .

[0094] It should be noted that the glue groove 230 provided at the bottom of the first support portion 210 extends along the length of the first support portion 210, and the glue groove 230 provided at the bottom of the second support portion 220 extends along the length of the second support portion 220. The specific number of glue grooves 230 can be adjusted accordingly based on the width of the first support portion 210 or the second support portion 220 in which the glue groove 230 is located. The wider the width, the greater the number of glue grooves 230 that can be provided. When there are multiple glue grooves 230, the glue grooves 230 at the bottom of the first support portion 210 are parallel to each other, and the multiple glue grooves 230 at the bottom of the second support portion 220 are parallel to each other.

[0095] In some optional embodiments, a glue groove 230 is also provided on the top of the filling piece 200 so that the top of the filling piece 200 can be connected to the upper cover 400 of the battery pack 10 by bonding and enhance the strength of the bonding connection.

[0096] In some optional embodiments, the width of the adhesive groove 230 is L, and the width of the filler 200 in which the adhesive groove 230 is located is B. B and L satisfy the following relationship: L = (1 / 3 to 1 / 4) B. When L > (1 / 3 to 1 / 4) B, the rigidity of the filler 200 may be weakened. When L < (1 / 3 to 1 / 4) B, the adhesive strength of the adhesive filled in the adhesive groove 230 may be weakened.

[0097] It should be noted that the width of the filling piece 200 where the glue groove 230 is located needs to be adjusted accordingly based on the location of the glue groove 230 on the filling piece 200. For example, if the glue groove 230 is located in the first support portion 210 of the filling piece 200, the width of the filling piece 200 where the glue groove 230 is located refers to the width of the first support portion 210 where the glue groove 230 is located. If the glue groove 230 is located in the second support portion 220 of the filling piece 200, the width of the filling piece 200 where the glue groove 230 is located refers to the width of the second support portion 220 where the glue groove 230 is located.

[0098] Regarding the shape of the glue groove 230 , in some optional embodiments, the edge of the notch of the glue groove 230 is an arc angle, and the side wall of the glue groove 230 and the bottom of the glue groove 230 transition in an arc.

[0099] Setting the edge of the notch of the glue groove 230 to a rounded angle can further increase the bonding area of ​​the glue groove 230. Similarly, setting the arc transition between the side wall of the glue groove 230 and the bottom of the glue groove 230 can also further increase the bonding area of ​​the glue groove 230.

[0100] In some optional embodiments, the filler 200 is a profile. Profiles have a fixed cross-sectional shape and size and high rigidity, and can be selected according to the filling gap in the battery pack 10. The manufacturing technology of profiles is mature and easily available.

[0101] The present disclosure does not limit the specific material of the filler 200. In some optional embodiments, the filler 200 is an aluminum profile. Compared to other profiles such as plastic and fiberglass, aluminum profiles have sufficient rigidity to provide the required support for the battery cell assembly 300. Furthermore, they have a higher melting point. Compared to steel profiles, aluminum profiles have a lower density, resulting in a lighter filler 200.

[0102] As shown in Figures 3-6, the present disclosure provides a battery pack 10 in the second aspect. The structure of the battery pack 10 includes a tray 100, a cell group 300 and the above-mentioned filling piece 200. The tray 100 has a cell accommodating space 111 with a top opening. The cell group 300 is placed in the cell accommodating space 111. A filling space 101 is formed between the cell group 300 and the side wall of the tray 100, and the filling piece 200 is arranged in the filling space 101.

[0103] The tray 100 serves as the mounting base for the cell group 300 and the filler 200. The cell group 300 can be placed from the top of the tray 100 into the cell accommodating space 111 within the tray 100, while the filler 200 fills the filler space 101 formed between the cell group 300 and the sidewalls of the tray 100. This allows the filler 200 to support the cell group 300. Furthermore, when the cell group 300 experiences thermal failure, the first channel 211 of the filler 200 can quickly transport the fumes generated by the thermal failure to the explosion-proof valve 120 for discharge, thereby enhancing the explosion-proof performance of the battery pack 10. Furthermore, for battery packs 10 with different cell counts, only different sizes and / or numbers of fillers 200 are required to effectively support the cell group 300, allowing battery packs 10 with different cell counts to share the same tray 100.

[0104] It should be noted that the tray 100 may include a bottom plate 113 and side beams 112. The side beams 112 are fixed to the bottom plate 113 and together define the cell accommodating space 111. The filling space 101 is also part of the cell accommodating space 111. When more cell packs 300 need to be placed in the battery pack 10, some of the cell packs 300 will be placed in the filling space 101 to replace the filler 200. The side walls of the tray 100 serve as the side beams 112 of the tray 100.

[0105] In some optional embodiments, the tray 100 includes a tray body 110 and a partition beam 130 disposed in the tray body 110 , wherein the partition beam 130 divides the tray body 110 into a plurality of battery cell accommodating spaces 111 ;

[0106] A filling space 101 is formed between the sidewall of the tray body 110 and the battery cell group 300 , and / or a filling space 101 is formed between the sidewall of the partition beam 130 and the battery cell group 300 .

[0107] The partition beams 130 cooperate with the tray body 110 to define a plurality of cell-accommodating spaces 111. Each cell-accommodating space 111 can be used to accommodate a cell group 300. On a tray 100 with partition beams 130, if there is a gap between the cell group 300 accommodated in the cell-accommodating space 111 and the sidewalls of the tray body 110, a filling space 101 is formed between the cell group 300 and the sidewalls of the tray body 110. If there is a gap between the cell group 300 accommodated in the cell-accommodating space 111 and the sidewalls of the partition beams 130, a filling space 101 is formed between the cell group 300 and the sidewalls of the partition beams 130. A filler 200 can be placed in each filling space 101 for filling.

[0108] It will be appreciated that in some optional embodiments, the tray body 110 and the partition beams 130 are both components of the tray 100 and together define the battery cell accommodation space 111. Therefore, the sidewalls of the tray 100 include both the sidewalls of the tray body 110 and the sidewalls of the partition beams 130. In some optional embodiments, the tray 100 is not provided with the partition beams 130, and the battery cell accommodation space 111 is defined by the tray body 110. In this case, the sidewalls of the tray 100 are the sidewalls of the tray body 110.

[0109] In the pallet 100 with the partition beam 130 , the partition beam 130 is fixedly connected to the pallet body 110 , and the fixed connection method includes but is not limited to any one or more combinations of welding, bolt connection, clamping, bonding, and integral molding.

[0110] In some optional embodiments, the partition beam 130 includes a transverse beam 131 and / or a longitudinal beam 132, and there are multiple filling pieces 200, wherein the multiple filling pieces 200 include filling pieces 200 that are symmetrically arranged along the longitudinal beam 132, and / or the multiple filling pieces 200 include filling pieces 200 that are symmetrically arranged along the transverse beam 131.

[0111] The partition beam 130 may include only longitudinal beams 132, only transverse beams 131, or both longitudinal beams 132 and transverse beams 131. When the partition beam 130 includes only longitudinal beams 132, the plurality of filler pieces 200 may include filler pieces 200 symmetrically arranged along the longitudinal beams 132. When the partition beam 130 includes only transverse beams 131, the plurality of filler pieces 200 may include filler pieces 200 symmetrically arranged along the transverse beams 131. As shown in FIG7 , when the partition beam 130 includes both longitudinal beams 132 and transverse beams 131, the plurality of filler pieces 200 may include filler pieces 200 symmetrically arranged along the longitudinal beams 132, filler pieces 200 symmetrically arranged along the transverse beams 131, or filler pieces 200 symmetrically arranged along both the longitudinal beams 132 and the transverse beams 131.

[0112] As shown in FIG5 , in some optional embodiments, the filling piece 200 may also be fixedly connected to the partition beam 130 , and a first notch 2111 and a second notch 2112 are provided on the filling piece 200 , so that the inlet 2113 and the outlet 2114 will not be blocked.

[0113] In some optional embodiments, the filling piece 200 and the partition beam 130 may be connected by welding. FIG5 shows a weld scar 240 formed by welding between the filling piece 200 and the partition beam 130 .

[0114] In some optional embodiments, a plurality of cell groups 300 are disposed in the cell accommodating space 111 , a second channel 320 is provided between the side wall of the partition beam 130 and the cell group 300 , and the second channel 320 is communicated with the inlet 2113 of the first channel 211 .

[0115] As shown in FIG5 , since the second channel 320 is between the sidewall of the partition beam 130 and the battery cell group 300 , when the battery cell group 300 fails due to thermal failure and generates smoke, part of the smoke will directly enter the second channel 320 , then enter the first channel 211 through the second channel 320 and be discharged from the explosion-proof valve 120 for pressure relief.

[0116] In some optional embodiments, the tray 100 has a partition beam 130, which can separate two adjacent battery cell groups 300. The second channel 320 can be set inside the partition beam 130, or the second channel 320 can be jointly defined by the adjacent battery cell groups 300 and the partition beam 130.

[0117] As shown in FIG5 , in some optional embodiments, a partition 310 is provided between the side wall of the battery cell group 300 and the filler 200 , and an air guide hole 311 is opened on the partition 310 , and the inlet 2113 of the first channel 211 is connected to the second channel 320 through the air guide hole 311 .

[0118] The partition 310 prevents direct contact between the cell group 300 and the filler 200, which could damage the cell group 300. Air guide holes 311 are provided in the partition 310 to provide communication between the first channel 211 and the second channel 320. If the filler is a metal profile, such as aluminum, the partition 310 can be made of an insulating material. This further prevents direct contact between the cell group 300 and the filler 200, which could lead to electrical leakage.

[0119] In some optional embodiments, as shown in Figure 6, the battery pack 10 also includes an upper cover 400, which is arranged at the opening of the battery cell accommodating space 111, and one side of the filling piece 200 in the height direction (the top as shown in Figures 1 and 3) is connected to the upper cover 400.

[0120] It is understood that one side of the filler 200 in the height direction includes one side in the height direction of the first support portion 210 and / or one side in the height direction of the second support portion 220. The end of the filler 200 in the height direction closer to the upper cover 400 is the top of the filler 200, and the end of the filler 200 in the height direction closer to the bottom of the tray 100 is the bottom of the filler 200.

[0121] After the upper cover 400 is placed on the opening of the battery cell accommodating space 111, the opening of the battery cell accommodating space 111 can be closed and formed into a whole. The internal space is sealed by the tray 100 and the upper cover 400, thereby effectively protecting the battery cell group 300 and the filling member 200. In addition, connecting the top of the filling member 200 to the upper cover 400 further improves the stability of the filling member 200 in the battery pack 10, so that the filling member 200 can provide more stable support for the battery cell group 300. In addition, after the top of the filling member 200 is connected to the upper cover 400, the filling member 200 can play a certain supporting role for the upper cover 400, thereby reducing the probability of deformation of the upper cover 400, and at the same time, to a certain extent, avoiding damage to the battery cell group 300 caused by the upper cover 400 being deformed by impact.

[0122] It should be noted that the upper cover 400 closes the cell accommodating space 111 by being connected to the tray 100 , and the connection methods between the upper cover 400 and the tray 100 include but are not limited to bolt connection, lock connection, etc.

[0123] In some optional embodiments, one side of the filler 200 in the height direction is bonded to the upper cover 400. The bonding of the filler 200 and the upper cover 400 can achieve the connection between the filler 200 and the upper cover 400 by bonding, and can also prevent damage to the upper cover 400 during the bonding process.

[0124] It should be noted that when the top of the filling piece 200 is connected to the upper cover 400 by bonding, a glue groove 230 can be set at the top of the filling piece 200 to increase the stability of the connection between the top of the filling piece 200 and the upper cover 400, while reducing the phenomenon of glue overflow at the edge.

[0125] As shown in FIG8 , the present disclosure provides an electric device 20 in a third aspect. The electric device 20 includes the above-mentioned battery pack 10 .

[0126] Here, the electrical device 20 may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy. The electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer. The present disclosure does not limit this.

[0127] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0128] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0129] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A filling member (200), characterized in that, The filler (200) is adapted to be disposed within a filling space (101) between a battery cell group (300) and a side wall of a tray (100); The filler (200) is provided with a first channel (211), an inlet (2113) of the first channel (211) is adapted to communicate with a battery cell accommodation space (111) within the tray (100), and an outlet (2114) of the first channel (211) is adapted to communicate with the exterior of the battery cell accommodation space (111).

2. The filling member (200) according to claim 1, characterized in that, The filler (200) includes a first support portion (210), one side of the first support portion (210) is adapted to abut against the battery cell group (300), the inlet (2113) is disposed on the first support portion (210), and the inlet (2113) communicates with at least one side of the first support portion (210) that abuts against the battery cell group (300).

3. The filling member (200) according to claim 2, characterized in that, One end of the first support portion (210) is provided with a first notch (2111), the first notch (2111) is adapted to jointly define a first opening (2115) with a side wall of the tray (100), and the first opening (2115) communicates with the inlet (2113).

4. The filling member (200) according to claim 2 or 3, characterized in that, The other end of the first support portion (210) is provided with a second notch (2112), the second notch (2112) is adapted to jointly define a second opening (2116) with a side wall of the tray (100), and the second opening (2116) communicates with the outlet (2114).

5. The filling member (200) according to any one of claims 1-4, characterized in that, A plurality of first weight reduction holes (212) are disposed within the first support portion (210), and at least one of the plurality of first weight reduction holes (212) is the first channel (211).

6. The filling member (200) according to any one of claims 2-4, characterized in that, The filler (200) further includes a second support portion (220), the second support portion (220) is disposed on the other side of the first support portion (210), and one end of the second support portion (220) remote from the first support portion (210) is adapted to be connected to a side wall of the tray (100).

7. The filling member (200) according to claim 6, characterized in that, The first support portion (210) and the second support portion (220) are integrally formed or fixedly welded.

8. The filling member (200) according to claim 6 or 7, characterized in that, The first support portion (210) and the second support portion (220) are perpendicular.

9. The filling member (200) according to any one of claims 6 - 8, characterized in that, A plurality of second weight reduction holes (221) are disposed within the second support portion (220).

10. The filling member (200) according to any one of claims 6-9, characterized in that, One side in the width direction of the first support portion (210) is adapted to abut against the battery cell group (300), there are a plurality of the second support portions (220), and the plurality of second support portions (220) are arranged at intervals along the length direction of the first support portion (210).

11. The filling member (200) according to any one of claims 1-10, characterized in that, At least one glue groove (230) is provided on at least one side in the height direction of the filler (200).

12. The filling member (200) according to claim 11, characterized in that, The width of the glue groove (230) is L, the width of the filler (200) where the glue groove (230) is located is B, and L and B satisfy: L = (1 / 3 - 1 / 4)B.

13. The filling member (200) according to claim 11 or 12, characterized in that, The edge of the notch of the glue groove (230) is an arc angle, and an arc transition is formed between the side wall and the bottom of the glue groove (230).

14. The filling member (200) according to any one of claims 1-13, characterized in that, The filler (200) is a profile member.

15. The filling member (200) according to any one of claims 1-14, characterized in that, The filler (200) is an aluminum profile part.

16. A battery pack (10), characterized in that, It includes a tray (100), a battery cell group (300), and the filler (200) according to any one of claims 1-15; The tray (100) has a battery cell accommodation space (111) with an open top. The battery cell group (300) is placed in the battery cell accommodation space (111). A filling space is formed between the battery cell group (300) and the side wall of the tray (100), and the filler (200) is arranged in the filling space.

17. The battery pack (10) according to claim 16, characterized in that, The tray (100) includes a tray body (110) and a partition beam (130) arranged in the tray body (110). The partition beam (130) divides the tray body (110) into a plurality of battery cell accommodation spaces (111); A filling space (101) is formed between the side wall of the tray body (110) and the battery cell group (300), and / or a filling space (101) is formed between the side wall of the partition beam (130) and the battery cell group (300).

18. The battery pack (10) according to claim 17, characterized in that, The partition beam (130) includes a cross beam (131) and / or a longitudinal beam (132). There are a plurality of fillers (200). Among the plurality of fillers (200), there are fillers (200) symmetrically arranged along the longitudinal beam (132), and / or among the plurality of fillers (200), there are fillers (200) symmetrically arranged along the cross beam (131).

19. The battery pack (10) according to claim 17 or 18, characterized in that, A plurality of battery cell groups (300) are arranged in the battery cell accommodation space (111). A second channel (320) is arranged between the side wall of the partition beam (130) and the battery cell group (300), and the second channel (320) communicates with the inlet (2113).

20. The battery pack (10) according to claim 19, characterized in that, A partition (310) is arranged between the side wall of the battery cell group (300) and the filler (200). An air guide hole (311) is formed on the partition (310). The inlet (2113) and the second channel (320) communicate through the air guide hole (311).

21. The battery pack (10) according to any one of claims 16-20, characterized in that, The battery pack further includes an upper cover (400). The upper cover (400) covers the opening of the battery cell accommodation space (111). One side in the height direction of the filler (200) is connected to the upper cover (400).

22. The battery pack (10) according to claim 21, characterized in that, One side in the height direction of the filler (200) is adhesively bonded to the upper cover (400).

23. An electrical device (20), characterized in that, It includes the battery pack (10) according to any one of claims 16-22.

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